DO I NEED TO REPLACE MY ENGINE?

2005 Toyota Camry • 145,000 miles

I have a 2005 Toyota Camry with ~ 145K miles. The timing chain went out on it last week. The repairman at the garage said the chains should never break. Because it did, that indicates there's something wrong with my engine - a lubrication problem. I change my oil religiously every 5K miles.